排序方式: 共有27条查询结果,搜索用时 31 毫秒
1.
Nonlinear Dynamics - This paper introduces new methods to study behaviours among the 52 largest cryptocurrencies between 01-01-2019 and 30-06-2021. First, we explore evolutionary correlation... 相似文献
2.
Longitudinal mode selection by injection has been demonstrated as a viable technique for TEA-CO2 lasers with pulse energies of a Joule or greater. Once reliable generation of single-longitudinal-mode (SLM) pulses is obtained, one can study the characteristics and the causes of intrapulse frequency variation. These include the effect of the decaying plasma, the thermal gradient due to the energy dissipation associated with the laser mechanism itself, and the pressure shift of the center frequency of the laser transition. The use of the positive-branch unstable resonator as an efficient means of coupling a discharge with large spatial dimensions to an optical cavity mode introduces another concern: namely, what can be done to emphasize transverse mode discrimination in an unstable resonator cavity while maintaining high coupling efficiency. These issues are discussed in this paper, and relevant experimental results are included. 相似文献
3.
A wide variety of 3-alkyne-1,2-diols have been found to undergo exceptionally clean 5-endo-dig cyclisations followed by dehydration at ambient temperature to give the corresponding furans in essentially quantitative yields when exposed to 10 mol % of 10% w/w silver(I) nitrate absorbed on silica gel. 相似文献
4.
Quantum systems that are confined to circuit geometries are called quantum circuits. Macroscopic superconducting circuits
are quantum circuits which can be modelled using a Quantisation by Parts scheme based on the macroscopic wave function approach of Feynman. This paper studies the circuit composed of an input wire
and an output plate. We find that in order to achieve a consistent theory of supercurrent flow we have to generalize the quantisation
by parts scheme to quantise in a path space. The generalized theory predicts a current flow down the wire into the plane.
In addition to a current flowing radially outwards in the plane, the theory allows a circulating current round the origin.
Strikingly, the circulating current can flow clockwise or anti-clockwise in such a way as to generate a magnetic moment of
magnitude half of a Bohr magneton for an orbiting electron in an atom and a magnetic flux half that of the magnetic flux quantum
of a superconducting ring. There is also the possibility of a macroscopic superposition of the two states of opposing circulating
currents resembling a Schr?dinger’s cat situation. Furthermore, we outline a setup involving an external magnetic field that
may allow experimental tests of the theory. 相似文献
5.
Donna J. Menzies Marek Jasieniak Hans J. Griesser John S. Forsythe Graham Johnson Gail A. McFarland Benjamin W. Muir 《Surface science》2012,606(23-24):1798-1807
In this work we report a detailed X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) study of poly(ethylene glycol) PEG-like chemical gradients deposited via plasma enhanced chemical vapour deposition (PECVD) at two different load powers using diethylene glycol dimethyl ether (DG) as a monomer. Principal component analysis (PCA) was applied to the ToF-SIMS data both before and after protein adsorption on the plasma polymer thin films. Results of the PCA loadings indicated a higher content of hydrocarbon fragments across the higher load power gradient, which adsorbed higher amounts of proteins. Gradients deposited at a lower load power retained a higher degree of monomer like functionality as did the central region directly underneath the knife edge electrode. Analysis of the adsorption of serum proteins (human serum albumin and fetal bovine serum) was monitored across the gradient films and increased with decreasing ether (PEG-like) film chemistries. The effect of protein incubation time on the levels adsorbed fetal bovine serum on the plasma polymer films was critical, with significantly more protein adsorbing after 24 hour incubation times on both gradient films. The attachment of HeLa cells on the gradients appeared to be dictated not only by the surface chemistry, but also by the adsorption of serum proteins. XPS analysis revealed that at surface ether concentrations of less than 70% in the gradient films, significant increases in protein and cell attachment were observed. 相似文献
6.
R. A. Smith J. B. Niederl J. H. C. Smith H. W. Milner A. W. C. Menzies F. Pregl Wm. J. Saschek M. Haitinger O. Heimstädt Ida B. Routh D. Kladischtscheff A. Soltys P. Muller G. Klein O. Werner H. Linser W. Jaeger L. Kofler W. Dernbach J. Deininger J. Donau F. Emich M. Malmy H. J. Fuchs G. W. Chapman E. Fränkel M. Gruber F. Feigl P. Krumholz Fr. L. Hahn G. Jaeger W. Herbert H. O. Hohl W. Münster J. Winkelmann A. Martini 《Analytical and bioanalytical chemistry》1934,99(9-10):355-364
7.
Pierre H. Flamant Robert T. Menzies Michael J. Kavaya Uri P. Oppenheim 《Optics Communications》1983,45(2):105-111
A grating-tunable TEA-CO2 laser with an unstable resonator cavity, modified to allow injection of cw CO2 laser radiation at the resonant transition line by means of an intracavity NaCl window, has been used to study the coupling requirements for generation of single frequency pulses. The width and shape of the mode selection region, and the dependence of the gain-switched spike buildup time and the pulse shapes on the intensity and detuning frequency of the injected radiation are reported. Comparisons of the experimental results with previously reported mode selection behavior are discussed. 相似文献
8.
Regula Theurillat Friederike A. Sandbaumhüter Claudia Gittel M. Paula Larenza Menzies Christina Braun Wolfgang Thormann 《Electrophoresis》2019,40(15):1959-1965
An enantioselective assay for the determination of methadone and its main metabolite 2‐ethylidene‐1,5‐dimethyl‐3,3‐diphenylpyrrolidine in equine plasma based on capillary electrophoresis with highly sulfated γ‐cyclodextrin as chiral selector and electrokinetic analyte injection is described. The assay is based on liquid/liquid extraction of the analytes at alkaline pH from 0.1 mL plasma followed by electrokinetic sample injection of the analytes from the extract across a buffer plug without chiral selector. Separation occurs cationically at normal polarity in a pH 3 phosphate buffer containing 0.16% (w/v) of highly sulfated γ‐cyclodextrin. The developed assay is precise (intra‐ and interday RSD < 4% and < 7%, respectively), is capable to determine enantiomer levels of methadone and 2‐ethylidene‐1,5‐dimethyl‐3,3‐diphenylpyrrolidine in plasma down to 2.5 ng/mL, and was successfully applied to monitor enantiomer drug and metabolite levels in plasma of a pony that was anesthetized with racemic ketamine and isoflurane and received a bolus of racemic methadone and a bolus followed by constant rate infusion of racemic methadone. The data suggest that the assay is well suited for pharmacokinetic purposes. 相似文献
9.
A versatile and rapid coating method via a combination of plasma polymerization and surface‐initiated SET‐LRP for the fabrication of low‐fouling surfaces 下载免费PDF全文
Yue Shi Donna J. Menzies Kelly M. Tsang Mark P. Del Borgo Christopher D. Easton Marie‐Isabel Aguilar Patrick Perlmutter Vinh X. Truong John S. Forsythe 《Journal of polymer science. Part A, Polymer chemistry》2017,55(15):2527-2536
In this work, we demonstrate the potential of surface‐initiated single electron transfer living radical polymerization for surface modification applications that confer low‐fouling properties. The versatility of the technique, which can be applied to a wide variety of substrates, has been displayed by the successful grafting of a range of monomers after immobilizing a bromine initiator on the surface via plasma polymerization. The thickness of the grafted surfaces can be controlled through variation of reaction parameters such as monomer concentration, reaction time, and the ratio between catalyst and ligand. Furthermore, the low‐fouling properties of the resulting surfaces were demonstrated against fully concentrated serum proteins and adhesive fibroblast cells, via grafting of N‐hydroxyethyl acrylamide (N‐HEA) or [2‐(methacryloyloxy)ethyl]dimethyl‐(3‐sulfopropyl) ammonium hydroxide (SBMA). This rapid and versatile coating technique, which has the ability to be applied to a wide range of substrates, can be performed in aqueous conditions without the exclusion of atmospheric oxygen, and shows excellent potential for the surface modification of biomaterial surfaces that require low‐fouling properties. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55, 2527–2536 相似文献
10.
A. Smith A. W. C. Menzies Holborn Henning und L. Derlin 《Fresenius' Journal of Analytical Chemistry》1912,51(1):53-57
Ohne Zusammenfassung 相似文献